Tubos India is one of the leading high quality 316 SS Tubing Suppliers. If SS 316 Seamless Tubes is certified as straight grade, the carbon content would have to be at a level of 0.03 % maximum in order to be dual certified. The grade 'L' in SS 316L Welded Tubes has a lower maximum carbon limit and the straight grade has increased mechanical properties. 316L Stainless Steel Tubing Suppliers has a long track record in the steel industry